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Source code for pytorch_lightning.plugins.precision.tpu

# Copyright The PyTorch Lightning team.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from functools import partial
from typing import Any, Callable, Union

from torch.nn import Module
from torch.optim import Optimizer

import pytorch_lightning as pl
from pytorch_lightning.plugins.precision.precision_plugin import PrecisionPlugin
from pytorch_lightning.utilities import _XLA_AVAILABLE
from pytorch_lightning.utilities.exceptions import MisconfigurationException

if _XLA_AVAILABLE:
    import torch_xla.core.xla_model as xm


[docs]class TPUPrecisionPlugin(PrecisionPlugin): """Precision plugin for TPU integration."""
[docs] def optimizer_step( self, model: Union["pl.LightningModule", Module], optimizer: Optimizer, optimizer_idx: int, closure: Callable[[], Any], **kwargs: Any ) -> None: if isinstance(model, pl.LightningModule): closure = partial(self._wrap_closure, model, optimizer, optimizer_idx, closure) closure_result = xm.optimizer_step(optimizer, optimizer_args={"closure": closure, **kwargs}) skipped_backward = closure_result is None # in manual optimization, the closure does not return a value if isinstance(model, pl.LightningModule) and model.automatic_optimization and skipped_backward: # we lack coverage here so disable this - something to explore if there's demand raise MisconfigurationException( "Skipping backward by returning `None` from your `training_step` is not implemented for TPUs." " Please, open an issue in `https://github.com/PyTorchLightning/pytorch-lightning/issues`" " requesting this feature." )

© Copyright Copyright (c) 2018-2022, William Falcon et al... Revision 76c23f34.

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